1 files changed, 19 insertions, 0 deletions
diff --git a/src/test/ui/mut/mutable-enum-indirect.rs b/src/test/ui/mut/mutable-enum-indirect.rs
new file mode 100644
index 000000000..502859c04
--- /dev/null
+++ b/src/test/ui/mut/mutable-enum-indirect.rs
@@ -0,0 +1,19 @@
+// Tests that an `&` pointer to something inherently mutable is itself
+// to be considered mutable.
+
+#![feature(negative_impls)]
+
+use std::marker::Sync;
+
+struct NoSync;
+impl !Sync for NoSync {}
+
+enum Foo { A(NoSync) }
+
+fn bar<T: Sync>(_: T) {}
+
+fn main() {
+    let x = Foo::A(NoSync);
+    bar(&x);
+    //~^ ERROR `NoSync` cannot be shared between threads safely [E0277]
+}